Differential gear welding structure

Abstract

The utility model discloses a differential gear welding structure which comprises a gear shaft and a gear arranged on the gear shaft in a sleeved mode, an annular abutting step is arranged on the side wall of the gear shaft, an annular welding portion which extends in the radial direction and abuts against the abutting step is arranged at one end of the gear, and the outer diameter of the welding portion is the same as that of the abutting step. An abutting gap is formed after the abutting step abuts against the welding part, and the outer edge of the abutting gap is connected through laser welding. The annular supporting table is arranged at the end of the gear shaft, a gear is placed at the outer end of the annular supporting table during installation, the gear can be supported by the annular supporting table, the gear is pressed into the interference installation part after passing through the transition part and a small-diameter section, and the gear abuts against the step to play a positioning role during press installation; in this way, two positioning processes during gear sleeving during press fitting and when press fitting is finished are reduced, the press fitting process is optimized, and in addition, the gap between the abutting step and the welding part can be used for laser welding and has enough strength after welding.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential gear, especially differential gear welding structure. BACKGROUND

[0002] The differential gear comprises a gear shaft and a gear installed on the gear shaft, and its main function is to automatically adjust the rotating speed of left and right wheels when the vehicle turns or runs on uneven road surface, so as to adapt to different driving requirements.

[0003] When installing, the gear needs to be sleeved on the installation shaft for welding, the gear shaft is generally an ordinary equal-diameter shaft or a stepped shaft, and two problems exist when sleeving, one is that positioning needs to be additionally performed when press-fitting and sleeving, so as to ensure the position of press-fitting, and the other is that the gear needs to be in interference fit with the gear shaft, and the ordinary shaft cannot preinstall the gear when press-fitting the gear, that is, the gear needs to be positioned by cooperating with other devices to ensure that the hole in the middle of the gear is opposite to the gear shaft, and then press-fitting can be performed, and the above two points both increase the difficulty of installing the gear and the gear shaft; in addition, after the existing structure press-fits the gear to the gear shaft, no gap for welding exists between the gear and the gear shaft, the welding position is at the root, so that a welding rod needs to be added for welding, and the adoption of laser welding causes the problem of weak strength at the welding position, and the welding efficiency of ordinary welding is far lower than that of laser welding. SUMMARY

[0004] In view of the problems that the ordinary equal-diameter or stepped gear shaft has great press-fitting difficulty in the press-fitting process of the gear and the gear shaft before welding and can only adopt ordinary welding after press-fitting and cannot adopt efficient laser welding in the prior art, the utility model provides a differential gear welding structure.

[0005] The utility model adopts the technical scheme that the differential gear welding structure comprises a gear shaft and a gear sleeved on the gear shaft,

[0006] The differential gear welding structure comprises a gear shaft and a gear sleeved on the gear shaft, a side wall of the gear shaft is provided with an annular abutting step, one end of the gear is provided with an annular welding portion extending in a radial direction and abutting on the abutting step, the welding portion has the same outer diameter as the abutting step, the abutting step and the welding portion abut to form an abutting gap, and the outer edge of the abutting gap is connected through laser welding.

[0007] Preferably, the gear is in interference fit with the gear shaft.

[0008] Preferably, one end of the gear shaft is an abutting section, the end is a stepped structure and the abutting step is located at the end, and the abutting section has an interference mounting portion with the same outer diameter as the inner diameter of the gear.

[0009] Preferably, one end of the interference mounting portion is provided with a circular truncated cone-shaped guide portion, the guide portion gradually increases in outer diameter from the sleeving end to the side of the abutting step, and the maximum outer diameter of the guide portion is the same as the outer diameter of the interference mounting portion.

[0010] Preferably, the other end of the gear shaft is a press-fitting section, and the maximum diameter of the press-fitting section is less than or equal to the inner diameter of the gear.

[0011] Preferably, the outer end of the press-fitting section is provided with a straight toothed spline.

[0012] Preferably, the press-fitting section is provided with a circumferentially extending annular support platform in the middle, the maximum outer diameter of the annular support platform is the same as the inner diameter of the gear, and the maximum outer diameter of the portions of the press-fitting section located on both sides of the support platform is less than the inner diameter of the gear.

[0013] Preferably, one side of the support platform is provided with a circular truncated cone-shaped transition portion integrated with the support platform, the transition portion gradually decreases in outer diameter from the press-fitting section to the abutting section, and the maximum outer diameter of the transition portion is the same as the outer diameter of the support platform.

[0014] Preferably, one side of the gear is provided with a plurality of helical teeth arranged in an annular array.

[0015] Preferably, the helical teeth are located on one side of the press-fitting section.

[0016] Compared with the prior art, the application has the following advantages: the gear shaft end portion is provided with an annular support platform, the gear is placed on the outer end of the annular support platform during installation, and the gear is supported by the annular support platform, and after being pressed into the press-fitting section through the transition portion and a small-diameter section, the gear is press-fitted in the interference mounting portion, the abutting step plays a positioning role during press-fitting, the two positioning processes of the gear during press-fitting and at the end of press-fitting are reduced, the press-fitting process is optimized, in addition, the gap between the abutting step and the welding portion can be used for laser welding and has sufficient strength after welding. BRIEF DESCRIPTION OF DRAWINGS

[0017] The application will be further described in detail below in conjunction with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments and thus should not be regarded as a limitation on the scope of the application. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 is a sectional view of the application;

[0019] Figure 2 is Figure 1 is an enlarged view of A in the middle;

[0020] Figure 3is a cross-sectional view of the gear shaft;

[0021] In the figure: 01, abutment gap; 10, gear shaft; 101, abutment boss; 102, interference fitting portion; 103, guide portion; 104, transition portion; 105, annular support platform; 106, straight spline; 1001, abutment section; 1002, press-fitting section; 20, gear; 201, welding portion. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0023] Example 1

[0024] Differential gear welding structure, such as Figures 1-3 As shown, it includes a gear shaft 10 and a gear 20 sleeved on the gear shaft 10. The side wall of the gear shaft 10 is provided with an annular abutting step 101. One end of the gear 20 is provided with an annular welding portion 201 that extends radially and abuts against the abutting step 101. The welding portion 201 has the same outer diameter as the abutting step 101. When the abutting step 101 and the welding portion 201 abut, an abutting gap 01 is formed. The outer edge of the abutting gap 01 is connected by laser welding.

[0025] Preferably, the gear 20 is interference fit with the gear shaft 10. The interference fit structure makes the connection between the gear 20 and the gear shaft 10 more secure.

[0026] Preferably, one end of the gear shaft 10 is abutting section 1001, which is a stepped structure with the abutting step 101 located at the end. The abutting section 1001 has an interference mounting portion 102 with an outer diameter the same as the inner diameter of the gear 20. The gear 20 is press-fitted and interference-fitted with the interference mounting portion 102.

[0027] Preferably, a truncated cone-shaped guide portion 103 is provided at one end of the interference fit portion 102. The outer diameter of the guide portion 103 gradually increases from the insertion end to the side abutting against the step 101, and the maximum outer diameter is the same as the outer diameter of the interference fit portion 102. The guide portion 103 is used to guide the gear 20 during the press-fitting process to facilitate press-fitting.

[0028] Preferably, the other end of the gear shaft 10 is a press-fit section 1002, and the maximum diameter of the press-fit section 1002 is less than or equal to the inner diameter of the gear 20. This solution ensures that the gear 20 can be press-fitted on the gear shaft 10 smoothly.

[0029] Preferably, the outer end of the press-fitting section 1002 is provided with a straight spline 106. The straight spline 106 is used for transmission during actual work.

[0030] As preferred, the middle part of the pressing section 1002 is provided with a circumferentially extending annular support platform 105, the maximum outer diameter of the annular support platform 105 is the same as the inner diameter of the gear 20, and the maximum outer diameter of the part of the pressing section 1002 on both sides of the support platform is smaller than the inner diameter of the gear 20. The annular support platform 105 is used for limiting the gear 20 before pressing, that is, the gear 20 is placed at the outer end of the annular support platform 105 before pressing, and the annular support platform 105 plays a supporting role at this time. When pressing, the gear 20 passes through the annular support platform 105 and is pressed in, and the part with a small diameter at the outer end is inserted into the hole in the middle part of the gear 20 to avoid the gear 20 from falling, and the small diameter part at the inner side is used to reduce the resistance of pressing.

[0031] As preferred, one side of the support platform is provided with a circular table-shaped transition part 104 which is integrated with the support platform, the outer diameter of the transition part 104 gradually decreases from the pressing section 1002 to the side of the abutting section 1001, and the maximum outer diameter of the transition part 104 is the same as the outer diameter of the support platform. The transition part 104 plays a transition role when pressing.

[0032] As preferred, one side of the gear 20 is provided with a plurality of annularly arrayed helical teeth 202 which are uniformly distributed, and the helical teeth 202 are located on one side of the pressing section 1002. The helical teeth 202 are used for transmission when working, and the setting mode is set according to the demand of transmission connection.

[0033] The differential gear welding structure provided by the present application is introduced above, and the principle and implementation mode of the present application are described by applying specific examples in this paper. The above description of the examples is only used to help understand the present application and the core idea. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A differential gear welding structure comprising a gear shaft and a gear sleeved on the gear shaft, characterized in that, The gear shaft side wall is provided with an annular abutting step, one end of the gear is provided with an annular welding part extending radially and abutting on the abutting step, the welding part has the same outer diameter as the abutting step, and the abutting step and the welding part form an abutting gap after abutting, and the outer edge of the abutting gap is connected by laser welding.

2. The differential gear weldment of claim 1, wherein, The gear and the gear shaft are in interference fit.

3. The differential gear weldment of claim 2, wherein, One end of the gear shaft is an abutting section, the end is a stepped structure and the abutting step is located at the end, and the abutting section has an interference installation part with the same outer diameter as the inner diameter of the gear.

4. The differential gear weldment of claim 3, wherein, One end of the interference installation part is provided with a circular truncated cone guide part, the guide part gradually increases in outer diameter from the sleeving end to the side of the abutting step, and the maximum outer diameter is the same as the outer diameter of the interference installation part.

5. The differential gear weldment of claim 3, wherein, The other end of the gear shaft is a press fitting section, and the maximum diameter of the press fitting section is less than or equal to the inner diameter of the gear.

6. The differential gear weldment of claim 5, wherein, The outer end of the press fitting section is provided with a straight toothed spline.

7. The differential gear weldment of claim 5 wherein, The middle part of the press fitting section is provided with a circumferentially extending annular support table, the maximum outer diameter of the annular support table is the same as the inner diameter of the gear, and the maximum outer diameter of the part of the press fitting section located on both sides of the support table is less than the inner diameter of the gear.

8. The differential gear weldment of claim 7, wherein, One side of the support table is provided with a circular truncated cone transition part integrated with the support table, the transition part gradually decreases in outer diameter from the press fitting section to the side of the abutting section, and the maximum outer diameter of the transition part is the same as the outer diameter of the support table.

9. The differential gear weldment of claim 1, wherein, One side of the gear is provided with a plurality of annularly arrayed helical teeth.

10. The differential gear weldment of claim 9, wherein, The helical teeth are located on one side of the press fitting section.

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